<template>
  <div
    v-if="isExternal"
    :style="styleExternalIcon"
    class="svg-external-icon svg-icon"
    v-on="$listeners"
  />
  <svg
    v-else
    :class="svgClass"
    :style="svgStyle"
    aria-hidden="true"
    v-on="$listeners"
  >
    <use :xlink:href="iconName" />
  </svg>
</template>

<script>
// doc: https://panjiachen.github.io/vue-element-admin-site/feature/component/svg-icon.html#usage
import { isExternal } from '@/utils/validate'

const THEME_COLORS = {
  white: '#fff',
  primary: '#409eff',
  secondary: '#e4e6ef',
  success: '#65d62c',
  info: '#1bc5bd',
  warning: '#ffa800',
  danger: '#f64e60',
  light: '#f3f6f9',
  black: '#000000',
  dark: '#181c32'
}

export default {
  name: 'SvgIcon',
  props: {
    iconClass: {
      type: String,
      required: true
    },
    className: {
      type: String,
      default: ''
    },
    color: {
      type: String,
      default: ''
    }
  },
  computed: {
    isExternal() {
      return isExternal(this.iconClass)
    },
    iconName() {
      return `#icon-${this.iconClass}`
    },
    svgClass() {
      var classes = ['svg-icon']
      if (this.className) {
        classes.push(this.className)
      }

      return classes
    },
    svgStyle() {
      var styles = []
      if (this.color) {
        const color = THEME_COLORS[this.color] || this.color
        if (/^(#|rgb|RGB)/.test(color)) {
          styles.push({
            fill: color,
            color: color
          })
        }
      }
      return styles
    },
    styleExternalIcon() {
      return {
        mask: `url(${this.iconClass}) no-repeat 50% 50%`,
        '-webkit-mask': `url(${this.iconClass}) no-repeat 50% 50%`
      }
    }
  }
}
</script>

<style scoped>
.svg-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  fill: currentColor;
  overflow: hidden;
}

.svg-external-icon {
  background-color: currentColor;
  mask-size: cover !important;
  display: inline-block;
}
</style>
